[Scoop-help] db_select returns nothing?

[johnzenger at mailc.net]

So I've got a page that is generated mostly from the results of a single
db_select query.  The first time I load the page, it all works fine. 
Then, I hit reload, and db_select does not return a sth, but instead
returns an undefined value.

Is this a problem with how I've set up MySQL?  Or am is there something
wrong with my query statement?:

    my ($rv, $sth) = $S->db_select({
        WHAT => qq~foreignk, anotherk, DATE_FORMAT(date_made, "%e %b %Y
        %T") AS date, field, ornate_field, prkey, quack~,
        FROM => 'supertable',
        WHERE => "prkey = 5",
        ORDER_BY => 'date_made DESC',
        NOCACHE => 1
    });